Improvement in valves for steam-engines



2 Sheets--Sheet 1.

A. CARR. Valves for S'tea'm-Engin'es.

Patented Oct. 21,1873.

- 1 [A444 11 @ZM ZISheetS--Sheet 2.

y A. CARR. Valves for Steam-Engines.

Patented Oct. 21,1873.

ILIAIIL UNrrnD STATES ATENT FFICE.

ADAM CARR, OF PATERSON, NEV JERSEY.-

IMPROVEMENT IN VALVES FOR STEAM-ENGINES.

specifi-ation forming part of Letters Patent No. 143,807, dated October21, 1873; application filed August 1,1873.

To all whom it may concern.:

Be it known that I, ADAM CARR, of Paterson, in the county of Passaic andState of New Jersey, have invented an Improvement in Valvesfor Engines,of which the following is a speciiication:

This invention is an improvement upon that set forth in Letters PatentNos. 105,986 and 110,294, and the improvement relates to the arrangementof the ports and passages of the valves and valve-seat.

In the drawing, Figure 1 is a vertical section of an engine fitted withmy improvement. Figs. 2, 3, 4, and 5 are sectional views, illustratingthe movement of the valves. Fig. 6 is a plan of the valve-seat. Fig. 7is a sectional view at the line y y, Fig. 6; and Fig. 8 is an invertedplan of the main and secondary valves. Fig. 9 is a similar view of themain valve without the secondary valve.

The cylinder a, piston c', piston-rod f, tappet a', lever a, andconnecting-rod t are similar to corresponding parts in aforesaid patent,and said rod t gives a positive movement to the secondary valve i, iirstin one direction and then in the other, as the lever a is moved by thetappet u striking its respective ends. The rod t, however, passes intothe steam-chest through a stuifmg-box. The secondary valve iis in aframe, c, to which the rod t is connected, and said valve is independentof the main valve o, but slides in a groove therein between it and thevalve-seat upon the cylinder a. The pistons r r. give movement to thevalve 0, and said pistons move in cylinders g1.

g2 in the steam-chest p. The steam passes to thisv chest p by the pipelw and one of the ports 8; and said ports are always open, as the valvesdo not move ,sufficiently far to cover them. These ports S are in thecylinder a, and there are connections upon both sides of said cylinderfor the pipe w or exhaust-pipe in; hence they can be connected towhichever side of the cylinder ay is most convenient, the openings inthe other side being closed by-screwplugs, as at w nv. VThis arrangementallows for removing the steam-chest without disconnecting either thesteam or exhaust pipes.

The operation of the steam-valves is as follows: Referring to Figs. 1and 2, the piston .'a/ is movin g in the direction of the arrow, andsteam is being admitted to the cylinder a by the port 3, and the exhaustpasses yby 2 to 4 through the main valve o, Fig. 2. Steam is sluit offto the cylinder g2; but the exhaust from g1 is open through the ports 101l 12 13 to 4. As the piston a completes its movement, the lever u andconnecting-rod t are moved, and the valve z' moved to the position shownin Fig. 3, which opens the port 17 for steam passing by 14 15 17 to thecylinder g2, and the pistons i" 0" and main valve o are moved, and themain and secondary valves assume the positions shown in Figs. 4 and 5.In this movement the exhaust from g1 remains open through 10 and a hole,16, in t' to 12,13, and 4; but the moment the steam through 14 and 15 iscut oft' by the surface of the valve o coming to the end of the valve i,the exhaust of g1 is stopped by the surface of o at 19closing the hole16, so as to conne any small quai'itity of vapor in g1 to cushion thepiston i, and at the same time the exhaust from g2 is opened through 1715 14 13 to 4. The valve 0 during its movement closes the port 3, andthen opens the exhaust from 3 to 4 simultaneously, admitting steam tothe cylinder a by the other ports 2 to movethe piston a. Vlien thepiston a' completes its movement in this direction, the lever u and rod't are again moved, and the valve 'L' is moved to the position -shown iuFig. 1; and during the movement of the valve 0 from the position Fig. 4to that of Fig. 1 the exhaust from g2 is cut off by the surface of o at20 closing the hole 21, so as to confine a small quantity of steam in g2to cushion the piston i", and then the exhaust to g1 is instantlyopened, thus providing for exhausting the steam from the respectivecylinders g1 g2 by the movement of the main valve; and the distancebetween the end of the valve -i and the exhaust-port 13 beingy thesameas the width ct' the port 12 or 14, the exhaust from the valve movingcylinder g1 or g2 is opened at the same instant that the steam is cutoit' from that cylinder, thereby taking oil' the actuating-pressiire,and thus preventing concussion on the valve-pistons.

I claim as my invention v l. The ports S 8 in the valve-seat of thecylinder a, in combination with the connections for the pipes w and xupon opposite sides 0f said cylinder, substantially as described.

. 2. The slide-valve o, provided With the ports 12 and 14, and thesecondarjr valve fi, with the ports 11, 13, and 15, constructed andarranged as specified, so that the motion of the main valve o closes theport to the valve-moving cylinder g1 or g2, and simultaneously opensjche exhaust from that cylinder7 as and for the Apurposes specified.

Signed by me this 29th day of July, A. D.

vVitnesses GEO. T. PINCKNEY, (1I-ms. H. SMITH.

